Stoker



May 24, 1932.

w. J. HAAG sToKER Filed NOV. 10, 1928 2 Sheets-Sheet 1 wwm ATTORNEY W. J. HAAG May 24. 1932.

STOKER Filed Nov. 10, 1928 2 Sheets-Sheet 2 INVEN'TOR m4; 15/2 .1. ///74.

ATTORNEY Patented May 24, 1932 UNETED STATES PATENT OFFICE WALTER J. I-IAAG, or DAYTON, OHIO, ASSIGNOR TOTHE BROWNELL COMPANY, or

DAYTON, 01110, A CORPORATION or OHIO A STOKER Application filed November 10, 1928. Serial No. 318,525.

My invntion relates to stolrers, and in particular to underfeed stokers.

It is the object of my invention to provide means of applying air to the central portion 50f the fuel bed of a fire box, particularly in connection with underfeed stokers.

It is my object to apply air, under pressure, at such points that are not ordinarily reached by the tuyeres that surround the margins of the coal bed through which air is normally delivered.

It is my object to provide a uniform burning of the bed of coal throughout its entire surface rather than at the margins, as is now the case.

Referring to the drawings:

Figure 1 is a vertical section through the bottom of a furnace, and through the fuel retort, tuyeres, etc.

Figure 2 is a section on the line 22 of Figure 1.

Referring to the drawings in detail, 1 and 2 indicate the front and rear walls supporting the boiler structure 3. The retort is desi gnated 4. Fuel is delivered by the screw 5 into the retort at the bottom and one end thereof through the pipe 6. The other end of said retort is dome shaped. Air under pressure is delivered through the pipe 7 to the chamber 8, around and below the retort whence it normally passes upwardly through the tuyere openings 9 in the tuyere casting 9' into the sides of the fuel. The tuyere casting is supported on the transverse members 10. 11 designates the usual dead plates upon which the ashes rest.

It will be observed there has been no means of delivering air heretofore to the center of the fuel bed. I have provided a transverse longitudinally arranged tube 12 forming an air passageway, which communicates with the openings 13 in the side walls of the retort for admitting air under pressure. This air is discharged through stoker openings arranged along the top of this air tube 12. Such openings are designated 14. The tube 12 forming an air passageway is located in the walls of the retort below the tuyere casting 9, and since the air openings in this tube are in the top thereof combustion cannot take place in the immediate vicinity of the body of the tube 12. This tube is therefore protected from: the heat of the burning fuel.

In cross section this air delivery means is streamlined in order to provide for the Having thus fully described my invention,

what I claim is new and desire to secure by Letters Patent, is:

1. In a furnace structure having walls forming an air chamber, transverse members in said chamber, a retort in said chamber, an air tube in said retort and supported thereby and having air connections with said chamber, a tuyere casting on said retort and supported by said transverse members, means for feeding fuel into said retort, and means for forcing air into said air chamber, said air tube and tuyere casting having tuyeres therein. for conducting air from the air chamber into the fuel.

2. In a furnace structure having walls forming an air chamber, the front and the rear walls having a ledge thereon, a transverse member adjacent each ledge, a tuyere casting supported by the transverse members, and a dead plate supported by each ledge and the adjacent part of the tuyere casting.

3. In a furnace structure having walls forming an air chamber, the front and the rear walls having a ledge thereon, a transverse member adjacent each ledge, a tuyre casting supported by the transverse members,

a dead plate supported by each ledge and the adjacent part of the tuyere casting, a retort in said air chamber beneath the tuyere casting, an air tube in said retort having air connections with said air chamber, said air tube and tuyere casting having tuyeres there- 2 p I r 1,859,297

in, and means for forcing air into said chamber through said tuyeres.

4. In a furnace structure, 1n combmatlon i Walls having transverse ledges thereon and forming an air chamber, a retort in said chamber, a transverse member adjacent each ledge, a-tuyere casting supported by the transverse members and resting upon the retort and a dead plate supportedvby each ledge and theadjacentipart of the tuyre casting.

In testimony whereof, I afliX my signature.

WALTER J. HAAG. 

